The 84th Field Artillery Regiment is a field artillery regiment of the United States Army.

The 3rd Missile Battalion, 84th Artillery Regiment was formed at Fort Sill in 1963 and deployed to Heilbronn, West Germany under the 56th Field Artillery Group. It was initially equipped with four Pershing 1 nuclear missiles, upgraded to six in 1964 and eight in 1965 and in 1969 replaced these with 36 Pershing 1a missiles. The battalion was redesignated as the 3rd Battalion, 84th Field Artillery Regiment in 1968. Service Battery was inactivated and reflagged as C Company, 55th Maintenance Battalion in 1982. The battalion exchanged the Pershing 1a missiles for Pershing II missiles in 1984. The battalion was inactivated in 1986 and reflagged as the 4th Battalion, 9th Field Artillery Regiment.